Multicomponent fractional quantum Hall states with subband and spin degrees of freedom

Abstract

In wide GaAs quantum wells where two electric subbands are occupied we apply a parallel magnetic field or increase the electron density to cause a crossing of the two $N=0$ Landau levels of these subbands and with opposite spins. Near the crossing, the fractional quantum Hall states in the filling factor range $1<\nu <3$ exhibit a remarkable sequence of pseudospin polarization transitions resulting from the interplay between the spin and subband degrees of freedom. The field positions of the transitions yield a new and quantitative measure of the composite Fermions' discrete energy level separations. Surprisingly, the separations are smaller when the electrons have higher spin-polarization.

References in corpus (7)

• Multicomponent fractional quantum Hall effect in graphene
• Valley polarization and susceptibility of composite fermions around nu=3/2
• Density dependence of valley polarization energy for composite fermions
• Spin-Polarization of Composite Fermions and Particle-Hole Symmetry Breaking
• Landau Level Anticrossing Manifestations in the Phase Diagram Topology of a Two Subband System
• Composite fermion valley polarization energies: Evidence for particle-hole asymmetry
• Modulation of bilayer quantum Hall states by tilted-field-induced subband-Landau-level coupling

Cited by in corpus (8)

• The enigmatic 12/5 fractional quantum Hall effect
• Light-induced fractional quantum Hall phases in graphene
• Morphing of 2D Hole Systems at $\nu =3/2$ in Parallel Magnetic Fields: Compressible, Stripe, and Fractional Quantum Hall Phases
• Unlocking new regimes in fractional quantum Hall effect with quaternions
• Search for Composite Fermions at Filling Factor 5/2: Role of Landau Level and Subband Index
• Re-Symmetrizing the Broken Symmetry with Isotropic Hydrostatic Pressure
• Pseudospin Polarization of Composite Fermions under Uniaxial Strain
• Electronic band structure in $n$-type GaAs/AlGaAs wide quantum wells in tilted magnetic field